Reese's double was a conventional bid for a take-out, showing a good hand. With eight points, Avarelli was compelled to ignore the intervening double and, with a choice of suits, to prefer his four-card major. East's raise to two hearts announced both that he had four-card support and a minimum hand.
Reese now jumped to three spades and, though Schapiro huddled for quite a long time, he eventually decided to pass. My own feeling is that the spade king and the doubleton queen of hearts justified his taking some action, and that action could not be anything but a raise to four spades. As I play, the double followed by a jump bid is a request to carry on unless partner's hand is entirely worthless, which Schapiro's was not.
In the other room, the bidding also stopped short.